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There is also a front and back reservoir that serve as backups for any air leaks. The second main part of an air brake system, the control system, is divided into a trailer brake circuit and a parking brake circuit, as well as brake circuits for the front and rear wheels. This air is stored in the supply reservoir which sends the air to the parking brake reservoir, primary reservoir, secondary reservoir, and auxiliary air supply distribution point. The supply system also contains a smaller purge reservoir to store and clean atmospheric air. Air brake systems are broken into two main parts: the supply system and the control system. The air pressure comes from atmospheric air and is compressed into the truck’s air compressor until the reservoir is around 120 PSI.Īir braking systems have several parts to ensure safe and proper braking control for large vehicles. For trucks with air brakes, the brake is held using spring pressure and air pressure. These features include:Īir brakes have different properties than traditional hydraulic brakes. They remain effective even if there is an air leak.Īir brakes include a variety of features to improve braking control and ensure backups for safety. They offer controlled pressure and backup air tanks to compensate if the compressor fails. Air brakes use atmospheric air that never runs out, rather than fluid which can leak. We’ve compiled a helpful resource on the basics you will need to know to pass your CDL Air Brakes Test, along with a practice air brakes quiz to get you started.Īir brakes are used on heavy trucks and buses because it provides a safe and reliable way to safely stop large moving vehicles.Īir brakes have several benefits over traditional hydraulic braking systems including: The best way to prepare for your CDL Air Brakes Test is to use CDL practice tests for air brakes, CDL air brakes study guides, and to take air brakes quizzes so you feel comfortable with the information before it’s time to take your test for real.
CRISTCDL COM GENERAL KNOWLEDGE TEST 6 DRIVERS
Drivers who take and pass this test are eligible to drive vehicles that require a CDL permit and use an air brake system. One optional section is the CDL Air Brakes test. The CDL general knowledge test covers several different sections.